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Immobilization of Self-Assembly of Pre-Dispersed Nano-TiO2 on Surface of Montmorrillonite and Its Photocatalytic Degradation on Organic Pollutant

Author: YuanLingLing
Tutor: YuJiang
School: Beijing University of Chemical Technology
Course: Environmental Science and Engineering
Keywords: Pre-dispersed Self-assembly Immobilized Nano-titanium dioxide Montmorillonite Adsorption Photocatalytic
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 34
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Abstract


Titanium dioxide is a very important photocatalyst . Dioxide absorbs ultraviolet light , the generation of reactive oxygen species ( such as hydroxyl radicals , etc.) has a strong oxidizing organic compounds , at the same time has a self-cleaning , deodorizing , antibacterial role . Titanium oxide powder has a larger surface area , in order to have a good catalytic activity in the reaction of the titanium oxide surface , but dioxide in the application of the process , there are the following two drawbacks : First, the titanium oxide particles is too small , in the application process easy to aggregate , to affect the catalytic effect of light ; , titanium oxide is recovered in the aqueous system more difficult, is not easy in the water phase separation . This paper proposes a method of nano-titanium dioxide immobilized in a clay surface : that is , by adding an aqueous solution of titanium tetrachloride dispersant by Hydrothermal Synthesis of highly dispersed nano- titanium dioxide dispersion based on the self-assembly of surfactant interaction between surfactant and nano titanium dioxide particles self-assembly behavior regulation of nano-titanium dioxide in the the montmorillonite surface immobilization process , optimize titanium dioxide the modified smectite photocatalytic material structure and properties . Experimental results show uniform morphology and particle size of the nano-titanium dioxide as a dispersing agent can be prepared , by adding cetyl trimethyl ammonium bromide ( of CTAB ) , diethanolamine (DEA) to obtain a highly uniform dispersion of nano-titanium dioxide changed smectite photocatalytic materials . Modified montmorillonite prepared self-assembled by pre-dispersed materials not only nano-titanium dioxide dispersion , and the modified montmorillonite specific surface area of the material , the average pore size and pore volume increased significantly help to improve the adsorption and photocatalytic material properties. Modified montmorillonite for the synthesis of 2,4 - dichlorophenol wastewater treatment , both montmorillonite adsorption properties and photocatalytic properties of titanium oxide modified montmorillonite treatment of phenolic wastewater . The modified montmorillonite Freundlich model 2,4 - dichlorophenol adsorption isotherms , adsorption kinetics and Lagergren second-order kinetics model coincide , basically there is no internal diffusion phenomenon ; studies have shown that the experimental synthesis of modified montmorillonite 2,4 - dichlorophenol photocatalytic degradation efficiency higher than commercial titanium dioxide ( P25 ) .

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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